1. SCOPE. a. This manual is published for the information and guidance of ordnance maintenance personnel. It contains detailed instructions for inspection, disassembly, assembly, maintenance, and repair of the Generating Unit M5 (including differences between M5 and M6), supplementary to those in the Field Manuals and Technical Manuals prepared for the using arms. Additional descriptive matter and illustrations are included to aid in providing a complete working knowledge of the materiel. b. These generating units have been assembled by different manufacturers who have used standard parts made by still other manufacturers. Working drawings have been furnished by the Ordnance Department. Similar parts will be found reasonably interchangeable regardless of where they are made. A metal plate is mounted on the instrument panel door of each unit, carrying the name of the manufacturer or prime contractor responsible for the construction of that particular unit. If required to make a record of this, be sure to copy the name exactly as it appears, because firm names are sometimes similar. For example, Units M5 have been made by the Hobart Manufacturing Company and by the Hobart Brothers Company, two entirely unrelated companies, both in Troy, Ohio. Digitized by Google.